They literally tried that strategy with Internet Explorer 6 a long time ago where they didn't really update it for years, only doing the bare minimum. The result was a downward spiral in market share that they were unable to stop once they started trying again, ultimately resulting in IE effectively becoming obsolete.
Because browsers are one of the very few components that actually need to catch up to the rest of the world, but they've already outsourced most of that work to Chromium.
